21y+13=90

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Solution for 21y+13=90 equation: 


Simplifying
21y + 13 = 90

Reorder the terms:
13 + 21y = 90

Solving
13 + 21y = 90

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-13' to each side of the equation.
13 + -13 + 21y = 90 + -13

Combine like terms: 13 + -13 = 0
0 + 21y = 90 + -13
21y = 90 + -13

Combine like terms: 90 + -13 = 77
21y = 77

Divide each side by '21'.
y = 3.666666667

Simplifying
y = 3.666666667

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